Keynote 
Change a chart from one type to another
You can change a chart from one type to another—for example, from a column chart to a bar chart, or from a 2D chart to a 3D chart.
Change a chart’s type
Select the chart.
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Click the Chart tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Chart tab, click
in the toolbar.
Click the Chart Type pop-up menu at the bottom of the sidebar, then choose an option.
If you can’t edit a chart, it may be locked. Unlock it to make changes.